Last week we did a Good Question inspired by the separation of former California Gov. Arnold Schwarzenegger and his wife Maria Shriver. We talked about the phenomenon of older, long-time married couples getting divorced. But now we know why this couple split.

When news broke that Arnold Schwarzenegger and Maria Shriver were splitting, it came as a shock. Married for 25 years, why split up now? It’s the same reaction many had with Al and Tipper Gore. So why are more couples getting divorced after spending so much time together?